The earthquakes were felt within 200 km distance from their epicenters. They caused intensive surface fissures along the faults with opening of around one meter at various places. Several accelerometers were operated in the near field. The highest measured maximum acceleration was 84% g in the June 21 earthquake (Þórarinsson et al. 2002). In spite of these strong surface effects no serious injuries were caused to people. The area where the effects of the earthquakes were most severe is a sparsely populated farming area. The villages closest to the epicenters are village Sólheimar (100 inhabitants), 5 km to the north of the June 21 fault, where the maximum acceleration was 71% g in the June 21 earthquake, and the the village Hella (600 inhabitants), 10 km to the south of the June 17 earthquake where the maximum acceleration was 47% g. No houses collapsed in the area but several houses were, however, so badly damaged that they had to be demolished. Several incidents of broken pipelines were reported (Þórarinsson et al. 2002). Following both mainshocks hydrothermal activity increased substantially over a large area around the two faults (Björnsson et al. 2001). Geysir, the great geyser, which lends its name to all the geysers in the world, is located 30 km to the north of the faults. It was reactivated after the earthquakes after having been more or less dormant for more than half a century. Water level changes in boreholes, observed immediately after the earthquakes, agree very well with the observed mechanisms of the earthquakes, with raised water level in the areas of compression and lowered levels in regions of extension. The shape of the signals reflects an impulse occurring immediately at the origin times of the two large earthquakes, with a relaxation tail of a few months. The magnitude of the signals was typically 0.1 to 1 bar, but may have exceeded 10 bars in a few cases close to the main earthquake faults. Signals were observed up to a distance of 75 km from the epicenters (Björnsson et al. 2001)